Seems that install failed to create the `vtunesag` group and `vtunesag` user required for dcom interface functioning.
You can workaround the issue by manual creating the group/user and re-run install. Issue below commands under root:
$ groupadd -g 28888 vtunesag
$ useradd -u 28888 -g vtunesag -r -s /bin/false -d /sbin vtunesag